Question about Bernina Bernette Deco 600

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Not catching stitches / bobbin correctly

I had my machine service not too long ago. They did correct all the tension and cleaned the machine. I was working right along and broke a needle, so I changed the needle and it was working fine. Then bobbin thread runs low (not out). so I take remaining thread of bobbin and fill it back up. Problem is now I can't get the bobbin thread to catch. I've assured the need is not bent, is inserted correctly and threaded right. I thread the bobbin as shown. Just won't catch. I do notice when I take the bobbin plate off and watch the machine work there is no movement at all. I'm assuming that the machanics are suppose to move the bobbin thread toward the needle so that it can catch. though I'm not an expert, I'm just surmising. Anyway, I'm getting really frustrated. I've cleaned out he bobbin area.. I just don't know what else I can do? Does anyone think retiming would work? How do I retime this machine?

Any help sure would be appreciated!

Lisa

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  • chward61462 Nov 15, 2008

    I have what sounds like the same problem with my Deco 600. It is several years old. Worked great to begin with but the last 5 -6 years has been a big paper weight! I love my ULT 2001...no problems at all.

    Any help with the deco?

    Thanks...


  • toohappy Jan 07, 2009

    I have the same problem. The needle is not catching the bobbin thread and nothing is moving in the bobbin area. It had been knotting really bad and then bam, nothing. HELP!!!!

  • mcpecans Jan 21, 2009

    I have the same problem, will not catch bobbon thread, and nothing is moving in bobbon area.

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Your timing has been messed up by breaking the needle.  When the needle hit the bobbin race, it shoved the needle bar up and now the needle is not in the correct position to catch the bobbin thread when the race rotates.  The needle has a little dip in the back, called the scarf.  When you take the neddle plate off and watch it move, you should see the little hook pass through the scarf.  That's how it makes the locking stitch and picks up the bobbin thread.  Unfortunately, you will need to take this in to a dealer or service place to have them adjust the needle bar height.  It's not a complicated task so see if they can check it while you wait.  It may be more difficult to fix, like retiming the machine.  But it doesn't sound like you've done any major damage to the mechanism.

Posted on Feb 08, 2009

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When you broke the needle I think you have moved the shaft that brings the needle down ,you can adjust it !

Posted on Nov 18, 2008

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1 Answer

Most of the time the bobbin stitch is correct. Occasionally there is a loop in the bobbin thread. Any suggestions as to what this could be?


Is it actually the bobbin thread that loops or is the loop appearing on the underside of the fabric as you stitch? If it is a loop under the fabric, that's usually an indication it is an upper thread issue. Thread irregularities that appear on the topside of the fabric are generally bobbin related.

First thing to try is installing a brand new needle. Verify it is the correct needle for the fabric and thread being used.
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Sometimes, the fabric being stitched will "grab" the thread and hold it for a second before releasing and will cause a loop. In this case, a needle with a larger scarf and eye may be helpful.

You might also open the upper tension as much as possible, RAISE the presser foot and run a piece of UNwaxed dental floss through the tension disk a few times to clear out any gunk that may be stuck there. A piece of pearl cotton dipped in rubbing alcohol and squeezed moist/dry will also work.

Remove the upper thread. RAISE the presser foot and rethread the top thread from the beginning. Use only fresh, good quality thread--NO old or bargain bin variety! Try using the same thread in the top and bobbin. Make sure the thread is firmly seated in the tension disk and the thread path is correct. Check that there are no burrs or snags in the thread path that could be catching the upper thread. Especially, check that the thread is not catching on the spool "slit" that holds the thread when in storage. Every time the thread navigates around the thread spool, it could be catching on that slit just enough to cause a loop.

Try changing the bobbin. There could be something amiss with the current bobbin--could be nicked or could even be the wrong bobbin for the machine. Also, make sure the bobbin is loaded and turning the correct direction in the machine.

Set the upper tension to the midway point. This is usually the starting point, although it will probably require some tweaking. Test your stitch and adjust the tension so the upper and bobbin threads meet in the middle of the fabric. Neither thread should dominate one side of the fabric or the other.

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Last thing to try is a different presser foot.

If you still have the intermittent loop, you might want to take it for service. Could be a problem within the tension disk.

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Remove all the thread from your machine. Make sure to clean around the feed dogs and bobbin area. Loosen the top tension disk all the way to zero & raise the presser foot. Dampen a piece of pearl cotton with rubbing alcohol and pull the pearl cotton gently down between the tension disk a couple of times. Consult your owner's manual and oil as instructed in the manual using ONLY fresh good quality sewing machine, applying 1-2 drops each spot indicated. Install a brand new needle. Avoid old, fuzzy, or bargain bin thread. With the presser foot in the RAISED position, rethread the top thread--verify it is threaded correctly. Reset the upper tension to about halfway between the high & low number. Make sure the bobbin case is threaded properly and verify the bobbin is turning the correct direction in the bobbin case. Install bobbin case in the machine. Test stitch on a scrap piece of fabric.

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Juki.co.jp


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